Align dependabot schedule with the PSModule template

Match the canonical Template-PSModule dependabot: daily github-actions updates with a 7-day cooldown.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: MariusStorhaug

.github/dependabot.yml

@@ -11,4 +11,6 @@ updates:
       - dependencies
       - github-actions
     schedule:
-      interval: weekly
+      interval: daily
+    cooldown:
+      default-days: 7